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    [PATCH] dm: support ioctls on mapped devices · aa129a22
    Milan Broz 提交于
    Extend the core device-mapper infrastructure to accept arbitrary ioctls on a
    mapped device provided that it has exactly one target and it is capable of
    supporting ioctls.
    
    [We can't use unlocked_ioctl because we need 'inode': 'file' might be NULL.
    Is it worth changing this?]
    Signed-off-by: NMilan Broz <mbroz@redhat.com>
    Signed-off-by: NAlasdair G Kergon <agk@redhat.com>
    
    Arnd Bergmann <arnd@arndb.de> wrote:
    
    > Am Wednesday 21 June 2006 21:31 schrieb Alasdair G Kergon:
    > > static struct block_device_operations dm_blk_dops = {
    > > .open = dm_blk_open,
    > > .release = dm_blk_close,
    > > +.ioctl = dm_blk_ioctl,
    > > .getgeo = dm_blk_getgeo,
    > > .owner = THIS_MODULE
    >
    > I guess this also needs a ->compat_ioctl method, otherwise it won't
    > work for ioctl numbers that have a compat_ioctl implementation in the
    > low-level device driver.
    Signed-off-by: NAndrew Morton <akpm@osdl.org>
    Signed-off-by: NLinus Torvalds <torvalds@osdl.org>
    aa129a22
device-mapper.h 6.2 KB